With Matt Mullenweg proclaiming "learn JavaScript deeply" during this year's State of the Word and WordPress.com's Calypso announcement, the WordPress community is abuzz about JavaScript. At the same time, many of us are left wondering what this means for the sites we manage or for our current and future development expertise. We can't help but ask: - Is WordPress abandoning PHP? - How will this affect our sites? - What the heck is JavaScript, anyways? - Most importantly, why do I care? This month, Andrew Duthie, himself a JavaScript engineer and full-time contributor to the Calypso project, will answer these questions, demonstrate how JavaScript is currently used in WordPress, and what the future might hold for WordPress and JavaScript.